AVOIDING POWER QUALITY PROBLEMS
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- Alfred Wade
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1 AVOIDING PROBLEMS COMBINED AND ENERGY CONSUMPTION MONITORING LINAX PQ-SERIES LINAX PQ3000 LINAX PQ5000
2 PAGE 2 POWER SYSTEM MONITORING Comprehensive instrument for power quality monitoring in electric mains Traditionally, power quality monitoring is only conducted as a reaction to trouble such as device failure, plant malfunctions, process interruptions or communication breakdowns. However, all these problems cost money and nobody wants to experience the same thing again just to be able to create a corresponding record for analysis. Therefore, the biggest advantage of continuous power quality monitoring is that users put themselves in a position to proactively build up their knowledge thus increasing system availability. LINAX PQ3000 / PQ5000 helps to detect trouble before it can do any damage and to provide data for the identification of the root cause in case an event actually occurs. PQ3000 / PQ5000 is a Class A device according to the IEC Ed.3 power quality standard. It can thus provide reliable and comparable information for regulatory agencies, negotiations with energy suppliers or internal quality control. It also supports a compliance report according to the EN voltage quality standard.
3 CLEAR High resolution, colour TFT display for the pin-sharp indication of measured data Consistently visible status information (alarms, password protection, data recording, time/date and much more) Clear Design INTUITIVE Language-specific plain text menu navigation Topical arrangement of measured value information for quick data access Service area for maintenance and commissioning MULTIFUNCTIONAL Certified power quality monitoring according to IEC Ed. 3, class A Acquisition of energy consumption: Meters and load profiles Plant condition monitoring FLEXIBLE Applicable in all network configurations without hardware variance Freely selectable measured variables for mean values and meters Freely definable alarm conditions with summary alarm and recording SCALABLE Combinable device design (functionality, interfaces, I/Os, auxiliary energy) May be integrated directly in the SMARTCOLLECT software
4 PAGE 4 POWER SYSTEM MONITORING AVOIDING PROBLEMS - THROUGH CONTINUOUS MONITORING Disruptions of the energy supply may result in production or equipment outages. Often people do not react until great financial damage has been caused. Yet, many of these incidents could be avoided if the signs were recognised in the continuous monitoring of the situation. Any form of power quality monitoring provides both a statistical evaluation allowing the comparison with standards (e.g. EN 50160) or supply contracts as well as records of events in the grid (e.g. voltage dips). This facilitates the analysis of causes and effects. EVALUATION DESCRIPTION BENEFIT Statistical evaluation All relevant parameters of the supply voltage are monitored, statistically averaged and compared to specified values. This way, one can either prove compliance or call attention to possible problems. Also currents are monitored for magnitude, harmonics content and unbalance. However, since there are no limit values, these results are not included in the statistical evaluation. Verification of the compliance with standards (e.g. EN 50160) or contracts between energy suppliers and energy consumers. Users may adapt the specified values as they desire. By observing changes in the results, one can detect any deterioration of power quality early on and identify the causes. Introduced improvements can be verified immediately. Recording of malfunctions All voltages are monitored for disturbances, such as dip, interruption or swell. These incidents are registered as event. A statistical evaluation is not required because there is no limitation for such events. An event recording comprises the waveshape of all voltages and currents upon occurrence of the event as well as the course of the corresponding RMS half cycle values for the entire duration of the event (max. 3 min.). The evaluation of malfunction recording lets you identify the cause of the malfunction and - at best - establish a correlation with the events witnessed (such as outage of control systems or equipment). Suitable remedies may then be derived. DATA EXCHANGE LINAX PQ3000 / PQ5000 stores the acquired power quality data in the standardized Power Quality Data Interchange Format (PQDIF) according to IEEE Many evaluation programs for the analysis of power quality data support this data format, e.g. SMARTCOLLECT PM20 of Camille Bauer Metrawatt or PQView of Electrotek Concepts. The storage principle provides daily PQDIF files containing either statistical data, histograms or event recordings. The creation is done shortly after midnight for the past day. All these files may also be generated manually via the service menu of the device at any time for the ongoing day.
5 POWER SYSTEM MONITORING PAGE 5 MONITORED VOLTAGE PHENOMENON CAUSES POSSIBLE CONSEQUENTIAL PROBLEMS Mains frequency Loss of power generators Large load changes Instability of the mains power supply Magnitude of supply voltage Changes in grid load Disruption of equipment System shut-down Loss of data Flicker and rapid voltage changes (RVC) Supply voltage dips and swells Frequent load changes Start of engines Large load changes Short circuit, contact to earth Thunderstorm Power supply overload Feed-in of renewable energies such as wind or photovoltaic energy Flickering lighting Impairment of the performance of exposed people Disruption of equipment such as control or drive systems Operational interruption Data loss in control systems and computers Voltage interruptions Supply voltage unbalance Voltage harmonics Short circuit Blown fuses Component failures Planned supply interruption Uneven load on phases due to one or twophase consumers Non-linear loads such as frequency converters, rectifiers, switching power supplies, arc furnaces, computers, fluorescent tubes etc. Production stoppage Process interruptions Data loss in control systems and computers Current in the neutral conductor Overload / overheating of equipment Increase of harmonics Reduction of machine efficiency Increased energy losses Overload / overheating of equipment Current in the neutral conductor Voltage interharmonics, mains signalling voltage on the supply voltage Frequency converters and similar control devices Flicker Malfunction of ripple control Current (magnitude, harmonics, interharmonics, events) In parallel with the voltages the corresponding current values are recorded in the same manner. Current course during voltage dips in the mains Avoiding power quality problems
6 PAGE 6 POWER SYSTEM MONITORING MEASURED VALUES MEASURED VALUE GROUP APPLICATION INSTANTANEOUS VALUES U, I, IMS, P, Q, S, PF, LF, QF... Transparent monitoring of present system state Angle between voltage phasors Fault detection, connection check, sense of rotation check Min/max of instantaneous values with time stamp Determination of grid variable variance with time reference EXTENDED REACTIVE POWER ANALYSIS Total reactive power, fundamental frequency, harmonics cosφ, tanφ of fundamental frequency with min values in all quadrants HARMONICS ANALYSIS (ACCORDING TO IEC ) Total harmonics content THD U/I and TDD I Individual harmonics U/I up to 50th IMBALANCE ANALYSIS Symmetrical components (positive, negative, zero sequence system) Imbalance (derived from symmetrical components) Deviation from U/I mean value ENERGY BALANCE ANALYSIS Meters for the demand/supply of active/reactive power, high/low tariff, meters with selectable fundamental variable Power mean values active/reactive power, demand and supply, freely definable mean values (e.g. phase power, voltage, current and much more) Mean value trends Reactive power compensation Verification of specified power factor Evaluation of the thermic load of equipment Analysis of system perturbation and consumer structure Equipment overload protection Failure/earth fault detection Preparation of (internal) energy billing Determination of energy consumption versus time (load profile) for energy management or energy efficiency verification Energy consumption trend analysis for load management OPERATING HOURS 3 operating hour counters with programmable running condition Monitoring of service and maintenance intervals of equipments Operating hours of the device Parameters according to IEC , Class A Chap. 5.1 Power frequency Chap. 5.2 Magnitude of supply voltage Chap. 5.3 Flicker Chap. 5.4 Supply voltage dips / swells Chap. 5.5 Voltage interruptions Chap. 5.7 Supply voltage unbalance Chap. 5.8 Voltage harmonics Chap. 5.9 Voltage interharmonics Chap Mains signalling voltage on the supply voltage Chap Rapid voltage changes (RVC) Chap Underdeviation and overdeviation Chap Current (magnitude, harmonics, interharmonics) Device type PQI-A FI2 (IEC ) Independent and accredited laboratory: Federal Institute of Metrology METAS. Tested at both 230V / 50Hz and 120V / 60Hz. Thanks to the certification according to IEC (standard for verifying compliance with IEC ) the device can serve as a reliable and comparable source of information for regulatory agencies, for negotiations with energy suppliers or for internal quality control. Generation of EN compliance reports by means of the SMARTCOLLECT PM20 Software. Improving the quality and reliability of the mains supply Identifying causes of disruptions
7 POWER SYSTEM MONITORING PAGE 7 DATA RECORDING Apart from the automatic recording of power quality statistics, the high-performance data logger provides the following recording options: PERIODIC DATA This feature allows to record the time course of measured variables. Averaged measurements or meter contents serve as base and are saved in regular intervals. Typical applications are the acquisition of load profiles (intervals of 10s to 1h) or the determination of the energy consumption from the difference of meter readings. For both categories pre-defined courses are available, based on the system power values, and as well courses for freely selectable basic quantities. For further processing periodic data can be exported in Excel format for a definable time range. EVENTS Here the occurence of events or alarms is recorded in form of a list with time information. A distinction is made between self-defined events (such as ON/OFF of limit states or monitoring functions) which the user can classify as alarm or event and the so-called operator list in which system events such as changes of the device configuration, reset operations, powering the device and many more are held. PQ EVENTS The occurrence of monitored PQ events is available in list form with the most important information about the events. Each entry can be directly selected to switch to the graphical event presentation. There the courses of the RMS half-cycle values and the waveshape during the disturbance are available, divided into presentations of all voltages, all currents and mixed displays. Event lists, PQ event recordings, mean value courses (load profiles) and meter readings may be displayed directly at the device or via the device webpage. Further analysis of the PQ events is possible by means of the SMARTCOLLECT PM20 software. MONITORING AND ALARMING The instrument supports the on-site analysis of acquired measured data in order to initiate directly immediate or delayed actions. This facilitates the protection of equipment and also monitoring of service intervals. The following items are available: 12 limit values 8 monitoring functions with 3 inputs each 1 collective alarm as a combination of all monitoring functions 3 operating hourcounters with definable running conditions The available digital outputs may be used directly for the transmission of limit values and monitoring functions as well as the resettable summary alarm. A text may be allocated to each monitoring function and can be used for both the alarm and event list in the data logger. Avoiding power quality problems
8 PAGE 8 POWER SYSTEM MONITORING OPERATION AND ANALYSIS OPERATION The local operation at the device itself and the access via web interface are structured identically. One can access the available measured data, parametrise the instrument or use the service functions via the language-specific, topically structured menu navigation. The status bar at the top right, uniformly shows the statuses of alarm monitoring, the password protection system, the data recording and the UPS as well as time and date. Apart from the details of the PQ statistics, all data are available via both the local GUI and the WEB interface of the device. ANALYSIS Using the SMARTCOLLECT PM20 software, PQDIF files generated in the device can be imported, either automated or manually, stored in the data base and analyzed. WIth this software all statistical power quality data can be evaluated and a detailed analysis of the PQ events can be made. The PM20 also provides the possibility to periodically retrieve state or energy consumption data from the device and store them in the data base. COMPLIANCE REPORT The SMARTCOLLECT PM20 software can be used to create a user-definable compliance report including all criteria of the EN ITIC CURVE This graphic shows all voltage events detected by the device with magnitude and duration of the event. All events outside of the range between the upper and lower curve may disrupt or damage connected equipment.
9 POWER SYSTEM MONITORING PAGE 9 TECHNICAL DATA INPUTS NOMINAL CURRENT 1 5 A (max. 7.5 A) Maximum 7.5 A Overload capacity 10 A permanent 100 A, 5x1 s, interval 300 s NOMINAL VOLTAGE Maximum Overload capacity Nominal frequency Sampling rate V LN, V LL PQ3000: 480 V LN, 832 V LL (sinusoidal) PQ5000: 520 V LN, 900 V LL (sinusoidal) PQ3000: 480 V LN, 832 V LL permanent PQ5000: 520 V LN, 900 V LL permanent 800 V LN, 1386 V LL, 10x1 s, interval 10 s Hz, Hz 18 khz POWER SUPPLY VARIANTS Nominal voltage V AC/DC (PQ5000) V AC, V DC (PQ3000) V AC, V DC (PQ3000) V DC (PQ3000 / PQ5000) Consumption 20 VA UNINTERRUPTIBLE POWER SUPPLY (UPS) Type (3.7 V) VARTA Easy Pack EZPAckL, UL listed MH16707 TYPES OF CONNECTION Single phase or split phase (2-phase system) 3 or 4-wire balanced load 3-wire balanced load [2U, 1I] 3-wire unbalanced load, Aron connection 3 or 4-wire unbalanced load 4-wire unbalanced load, Open-Y I/O-INTERFACE ANALOG OUTPUTS Linearisation Range Accuracy Burden RELAYS Contacts Load capacity (optional) Linear, kinked ± 20 ma (24 ma max.), bipolar ± 0.2 % von 20 ma 500 Ω (max. 10 V/20 ma) (optional) Changeover contact 250 V AC, 2 A, 500 VA; 30 V DC, 2 A, 60 W DIGITAL INPUTS PASSIVE Nominal voltage 12/24 V DC (30 V max.) DIGITAL INPUTS ACTIVE (optional) Open circuit voltage 15 V DIGITAL OUTPUTS Nominal voltage 2, Standard 12/24 V DC (30 V max.) FAULT CURRENT MONITORING For grounded systems (optional) Number of meas. channels 2 (2 measurement ranges each) Measurement range 1 (1A) Measuring transformer Alarm limit Earth current measurement 1/1 up to 1/1000 A 30 ma up to 1000 A Measurement range 2 (2mA) RCM with connection monitoring Measuring transformer Residual current transformer 500/1 up to 1000/1 A Alarm limit 30 ma up to 1 A BASIC UNCERTAINTY ACCORDING IEC/EN Voltage, current ±0.1 % Power ±0.2 % Power factor ±0.1 Frequency ±0.01 Hz Imbalance U, I ±0.5 % Harmonic ±0.5 % THD U, I ±0.5 % Active energy Class 0.5S (IEC/EN ) Reactive energy Class 0.5S (IEC/EN ) INTERFACES ETHERNET Physics Mode Protocols MODBUS/RTU Physics Baud rate TIME REFERENCE Clock accuracy Synchronisation Standard Ethernet 100Base TX; RJ45 socket 10/100 MBit/s, full/half duplex, autonegotiation Modbus/TCP, http, NTP (time synchronisation) Standard (PQ5000), optional (PQ3000) RS-485, max m (4000 ft) 9.6 to kbaud Internal clock ± 2 minutes/month (15 to 30 C) via NTP server or GPS ENVIRONMENTAL CONDITIONS, GENERAL INFORMATION Operating temperature without UPS: 10 up to 15 up to 30 up to + 55 C with UPS: 0 up to 15 up to 30 up to + 35 C Storage temperature 25 to +70 C Temperature influence 0.5 x basic uncertainty per 10 K Long-term drift 0.5 x basic uncertainty per year Others Aplication group II (IEC/EN ) Relative air humidity <95 % without condensation Operating altitude 2000 m above NN Only to be used in buildings! MECHANICAL PROPERTIES Housing material Polycarbonate (Makrolon) Flammability class V-0 according UL94, self-extinguishing, not dripping, free of halogen Weight 800 g (PQ3000), 600g (PQ5000) SAFETY Current inputs are galvanically isolated from each other. Protection class II (protective insulation, voltage inputs via protective impedance) Pollution degree 2 Protection IP54 (front), IP30 (housing), IP20 (terminals) Measurement category CATIII Avoiding power quality problems
10 PAGE 10 POWER SYSTEM MONITORING ORDER CODE PQ BASIC DEVICE FOR PANEL-MOUNTING With TFT display 1 2. INPUT FREQUENCY RANGE Current transformer inputs, 42 50/60 69,5 Hz 1 3. POWER SUPPLY Nominal voltage V AC, V DC 1 Nominal voltage V DC 2 Nominal voltage V AC, V DC 3 4. BUS CONNECTION Ethernet (Modbus/TCP protocol+web server) 1 Ethernet (Modbus/TCP+web server)+rs485 (Modbus/RTU) 2 5. EXTENSION 1 2 relays 1 2 analog outputs, bipolar (± 20 ma) 2 4 analog outputs, bipolar (± 20 ma) 3 4 digital inputs passive 4 4 digital inputs active 5 Fault current detection, 2 channels 6 GPS connection module 7 6. EXTENSION 2 2 relays 1 2 analog outputs, bipolar (± 20 ma) 2 4 analog outputs, bipolar (± 20 ma) 3 4 digital inputs passive 4 4 digital inputs active 5 Fault current detection, 2 channels 6 GPS connection module 7 7. EXTENSION 3 2 relays 1 2 analog outputs bipolar (± 20 ma) 2 4 analog outputs bipolar (± 20 ma) 3 4 digital inputs passive 4 4 digital inputs active 5 Fault current detection, 2 channels 6 Uninterruptible power supply 8 8. TEST CERTIFICATE Test certificate in German D Test certificate in English E DIMENSIONAL DRAWING PQ3000 ORDER CODE PQ BASIC DEVICE FOR TOP-HAT RAIL MOUNTING Without display 0 With TFT display 1 2. INPUT FREQUENCY RANGE Current transformer inputs, 42 50/60 69,5 Hz 1 3. POWER SUPPLY Nominal voltage V AC/DC 1 Nominal voltage V DC 2 4. BUS CONNECTION Ethernet (Modbus/TCP+web server) + RS485 (Modbus/RTU) 1 5. UNINTERRUPTIBLE POWER SUPPLY With uninterruptible power supply 1 6. EXTENSION 1 2 relays 1 2 analog outputs, bipolar (± 20 ma) 2 4 analog outputs, bipolar (± 20 ma) 3 4 digital inputs passive 4 4 digital inputs active 5 Fault current detection, 2 channels 6 GPS connection module 7 7. EXTENSION 2 2 relays 1 2 analog outputs, bipolar (± 20 ma) 2 4 analog outputs, bipolar (± 20 ma) 3 4 digital inputs passive 4 4 digital inputs active 5 Fault current detection, 2 channels 6 GPS connection module 7 8. TEST CERTIFICATE Test certificate in German D Test certificate in English E ACCESSORIES EXTENSIONS PQ3000 Maximum one extension with analog outputs may be provided per device. ARTICLE NO Documentation on USB stick Interface converter USB <> RS GPS receiver 16x-LVS, configured Transformers for fault current detection see accessory current transformers DIMENSIONAL DRAWING PQ mm Panel cut-out 70 mm 160 mm
11 POWER SYSTEM MONITORING PAGE 11 SMARTCOLLECT SMARTCOLLECT is a data management software which can acquire measured data in an easy manner and store the same in an open MS SQL database. This software offers basic functionalities for data analysis and for easy energy monitoring as well as the easy preparation and disposal of reports. Providing a mature graphic user interface, the SMARTCOLLECT software is clearly structured and easily operated. SMARTCOLLECT is modularly designed and permits supplementing modules or functions at any time. CUSTOMER BENEFITS Easy data communication via Modbus RTU / TCP, ECL and SmartControl-Direct Connection also via OPC Devices of Camille Bauer and Gossen Metrawatt are already predefined and selectable in the software Open for the devices of all manufacturers Data is stored in an open MS SQL database (depending on the scope Express or Server) Modular cost / performance model basic version may be extended at any time MODULAR DESIGN COMPONENTS The SMARTCOLLECT data management software consists of the following components: SMARTCOLLECT CLIENT SQL DATABASE MORE CLIENTS POSSIBLE SMARTCOLLECT CLIENT Graphic visualisation of queried data Export via Excel file User interface to define the data sources to be read out as well as error and warning messages via . SMARTCOLLECT DATABASE MS SQL database (depending on the scope Express or Server) Contains the collected data Open and unencrypted SMARTCOLLECT SERVER SMARTCOLLECT SERVER Collects and configures data from active sources and channels and writes the same directly into the central database. MM1400 AM1000 AM3000 PQ3000 BM1200 Energy meter SMARTCOLLECT software components may be installed on an individual system or on several servers or computers. Avoiding power quality problems
12 Camille Bauer Metrawatt AG Aargauerstrasse Wohlen Switzerland TEL FAX info@cbmag.com Subject to change without notice SM EN-04.18
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